

#include<stdio.h>
int main()
{
	int i = 0;
	int count = 0;
	for (i = 1; i <= 100; i++)
		{
			if (i % 10 == 9)
				count++;
			if (i / 10 % 10 == 9)

				count++;
		}
	printf("%d", count);
	return 0;
}